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Built in newest DSP software, best sound quality PCM1704UK , balance class A headphone / preamp up to 9000mW @ 40 ohm (Class A ) and 16000mW @ 25 ohm (Max) output, 6 groups digital inputs and 3 groups analog inputs.
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NOS 11 (Release at 1st July)

Discrete  DAC + Headphone amplifier / Preamplifier
Combine from the NOS 7 + Master 9

Built in DSP data processor
Supports up to 768KHz
32bit / 384K Asynchronous Transfer 
Amanero combo384
Built in 4 Pieces Hi-grade PCM1704UK Chips
9000mW at 40 ohm (Class A
, per channels )
16000mW at 25 ohm (Max
, per channels)
OCC
wires and TCXO built in


Price :   USD1880
 (Exclude shipping cost ,With remote control)

       

     

     
Summarize Use Manual Specs Custom Option Shipping Cost

Click to read the Amanero combo 384

Audio-gd products had design and test based on the AP SYS-2722 (The top-drawer professional equipment in world)

Reviews:
http://www.head-fi.org/t/806397/audio-gd-new-nos-7-2016-edition-impression-thread/60

How to update the firmware

Since Oct. 12th. 2016 , the unit had update the Ver 2 DSP software:
          The Ver 2 DSP software had improve on the timing performance, hence can support high res music better and working better on high oversampling input, users can hear more better detail in sound quality . And the new software had addition the 3rd Nos mode for users choice for their favorite taste.

What's new in the NOS 11:
         The NOS 11 is the ultimate design of the PCM1704 chip based on a lot our older PCM1704 product users feedback .
          A lot users feedback they like the NOS sound in the PCM1704 products, let me made the  decision to design a new software offer the better performance of the NOS mode.
          For the most real like sound reproduce, Mr.Kingwa had spend a long term to  design and rectify the new NOS DSP software personally, not only based the the software codes , but he  also well know on the hardware compatible and  sensitivity on the sound quality  .
          In the design had applied -6db /oct passive analog filter , you can hear the wonderful sound of the NOS but you can't hear the noise as other some NOS design .
          100 people may had 99 type prefers . We had design two NOS modes in the software for users select.
          One is the best speed data process, another is applied large algorithm to process the data.
          The full new design concept had boost the PCM1704 support up to 768KHz even 1536KHz (test in emulation mode).
           A high exact TCXO for the DSP chip   running in the asynchronous data process mode, it don't want the source master clock input , which is reduce the signal transmit request, FIFO design and rebuilt the clock by the DSP chip, can refuse the jitter .       
           There are no design compromises, no parts are upgradeable, built with all high-grade audio parts, OCC wires, TCXO ,ect.

           IN1: Optical input, up to 24bit / 96KHz support .
           IN2: coaxial input, up to 24bit / 192KHz support .
           IN3, Coaxial input, up to 24bit / 192KHz support .
           IN4, BNC input , up to 24bit / 96KHz support .
           IN5 , I2S input, ,up to 32bit / 384KHz support  .
           IN6 , USB input,  ,up to 32bit / 384KHz support  . 


Different to the Master  11:
          The Master 11 had the 8X times oversampling and NOS mode can be selection .
          The NOS 11 had the more advantage algorithm   than the NOS mode of the Master 11 .
          The oversampling design and NOS design had different sound characteristic ,it is not which is better but depend on the customer's prefer.
         We can't exact explain the different in English, please search in web .


DAC / Headphone amp / preamp all in one
Fully balanced pure class A design built by discrete analog stages without any OPA or coupling caps in the signal channels.
Non- feedback ACSS analog output stage.
Total applied 8 pcs exact matching 150W transistors ( In total 1200W ) as the output stages  for implement large class A output power .
Uses three R-core transformers (In total 195W ) separate power supplies for the digital control components, right and left channels.
More than 50,000uf audio grade NOVER capacitors are used to ensure ample and smooth power supply.
A total of 9 groups class A PSU's  are used to purify the power supply. To achieve a high S/N ratio, the control circuit is powered with separate regulators.
Uses high-grade parts and exactly matched transistors.
Four-channel 100 steps digitally controlled relay-based volume control avoids channel imbalance and improves sound quality .
6 digital inputs:
  Optical / RCA coaxial / RCA coaxial / BNC coaxial / I2S / USB
3 analog preamp inputs:  XLR / RCA / RCA
Preamp / DAC output :
  XLR / RCA (Variable in Preamp mode, fixed in DAC mode)
Headphone amp output: 4pins XLR X1 / 3pins XLR X2 / 6.3MM X1
Memorizes all settings and resumes the last setting when powered on (see user manual).


Modification guide on headphone jack for 4-pin balanced headphone output.
  
Click here to read:   modification guide

Parts for the modification is USD30. (Includes one female 4-pin plug and one male 4-pin plug, some tape and WBT tin solder)



Below is the picture of the DSP input , was from the Amanero connect the macBook pro .


And after the DSP process :

Detail of the Current Conveyor (ACSS) Technology

ACSS:     
            The NOS 11 applied real balanced fully discrete amp without any OPAs (the OPAs in NOS 11 only for DC serve) ,without any couple caps ,fully non- feedback . Applies the 4 Pieces Expensive high-end grade PCM1704UK which can support up to 32Bit/384KHz input . Compare to other PCM1704UK designs , we applied Non-feedback ACSS analog stages. The 4 pcs PCM1704UK feed to the ACSS analog stages without any OPAs and couple caps so it can avoid sound coloration .
            The ACSS is a non-feedback technology made with fully discrete amplifiers. Most people know the global feedback design can offer better specs in test measurements, and classic non-feedback can't do well in test measurements but can offer better sound for the human's ears. Here is a conflict of the classic circuits. But the ACSS opens a new field, it can offer a least coloration sound which is more neutral with very low distortion and high linearity. So it can retain the dynamics, detail and neutral sound but not sound bright or harsh.

D/A:
          
Applies the 4 Pieces Expensive high-end grade PCM1704UK . The PCM1704 UK had been consider the best neutral and "sound like real " DA chips by a lot hififolks, but TI want to discontinued PCM1704 and  increased the price to USD48/pc  , cause the market price increase to USD70/pc .

Output buffer:       
            The NOS 11 output buffers had applied 4 pair power transistors ( 150W / 15A ) working on  class A state, the output impedance is only 1 ohms , it can drive most headphones and amps as well .
NOS 11 has all components of four channels exactly matched before installation.
             The analog part is without couple caps to avoid coloration, and power supply by four groups class A PSUs.
             Applies ACSS technology, even though maybe you only connect to XLR or RCA output, NOS 11 will always operate in ACSS technology, and benefit from ACSS technology. Therefore, XLR and RCA output will also definitely bring about improvement in sound quality. Even through RCA output, the 4X PCM1704UK DA chips will perform fully.
                      
DSP-1 processor:
       
 For the most real like sound reproduce, Mr.Kingwa had spend a long term to  design and rectify the new NOS DSP software personally, not only based the the software codes , but he  also well know on the hardware compatible and  sensitivity on the sound quality  .
          In the design had applied -6db /oct passive analog filter , you can hear the wonderful sound of the NOS but you can't hear the noise as other some NOS design .
          100 people may had 99 type prefers . We had design two NOS modes in the software for users select. Since Oct. 12th. 2016, the new Ver 2 software had offer 3 Nos modes .
          One is the best speed data process, another is applied large algorithm to process the data.
          The full new design concept had boost the PCM1704 support up to 768KHz even 1536KHz (test in emulation mode).
           A high exact TCXO for the DSP chip   running in the asynchronous data process mode, it don't want the source master clock input , which is reduce the signal transmit request, FIFO design and rebuilt the clock by the DSP chip, can refuse the jitter .       

Power supply:
              NOS 11 applies the excellent 4 pcs PCM1704UK with DSP-1 combo and excellent analog output amps, but these are not the only keys of the best sound. The power supply is most important. Even applying the best DA chip and the best amp, if matched to a normal power supply, the total sound may still be average or sound musical, but can't be neutral and detailed. That is why it is easy to find hi-end grade gears maybe without the best chips or amp stages, but with plenteous dedicated DC supply circuits.
             The NOS 11 uses 8 groups of high-quality class A parallel connection PSU , which can offer very clear DC power for the DAC and amps, producing a very black background and neutral sound characteristic. The class A  PSU is very important for digital parts. Some designs may have very low jitter in theory, but if the power is supplied by a dirty or low-speed power supply, it will increase the jitter and pollute the data, and degrade the sound quality obviously.
             The class A parallel connection PSU has very high input impedance to avoid pulse through the PSU from affecting the DAC and low output impedance with very fast speed and high linearity, so it is a very clean power supply. In my experience, its sound is better than battery power supply, better human sound and neutral.
             The NOS 11 uses three high performance transformers. More than 50,000uf audio grade NOVER capacitors are used to ensure ample and smooth power feed. A total of 8 groups class A SPUs and 3 groups linear PSUs are used to purify the power supply. To achieve high S/N, the control circuit is powered with separate regulator.

      
Volume control:
              The volume control is also different from conventional technology. Conventional volume control technology is the volume control implement in the analog amp input stage through a volume pot to reduce the signal . The volume pots quality effect the sound quality direct , the low quality volume pot cause lost the detail and channels imbalance cause the soundstage distortion . Even the high performance volume pot still cause the detail lose. Whatever quality volume pots, must cause the S/N worst .
               But in the NOS
 11 , we applied the I/V conversion volume control , the volume control just a variable passive I/V conversion place at the ACSS amp output , where the output is the current signal, not the voltage signal. The volume control is I/V conversion, and the volume depends on the current (I) conversion to the voltage (V). (Like R-2R D/A chips output passive I/V conversion) It can keep the signal frequency band flat and not lost any detail. It can't degrade on sound quality in every volume level . After the volume , there are four groups  diamond non-feedback buffer output stages offer the very low output impedance .
               The volume control quality is much important in the real balance gear . It must guarantee the four channels signal control exact to achieve the performance of the real balance gear . If the cool and hot of the balance signal can't guarantee exact, the balance output will has large distortion cause the sound quality and performance even much worst than a single end gear waste the balance gear design and the cost.
In NOS
 11 is applied a four channels digital control relays based volume control. .NOS
 11 has total four channels through changing the DALE resistors to control the volume for avoid channels imbalanced ,achieve the best performance and sound quality of the gear.
                 NOS
 11 have 100 steps volume control, control range achieve 90DB (usually the steps volume ports, potentiometer volume port, relays base volume control all have around 70DB range ), very smooth control range on first 50 steps , cooperate with 20DB high gain, so can very easy adjust the volume for both high / low sensitivity headphone and speakers. While change the volume, the different relays break or close, it may had slightly switch sound on output and disappear while stop change the volume.
          
Supper Exponential volume characteristic        The Volume steps comparison to normal volume knob       
                                                                               

Shield: 
            NOS 11 has complete separation of left, right amplifier channels, power supply, and transformer.
             NOS 11 uses heavyweight all-aluminum alloy chassis to prevent the eddy current of transformers from interfering on circuit board. 
            NOS 11 applies optical couple isolation for the MCU and the control implementations to prevent the MCU affecting the audio parts.
           


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